EXC BAD ACCESS

lastmod 2026-11-10created 2018-11-284 edits

EXC_BAD_ACCESS is a Mach exception raised on macOS and iOS when a program tries to read or write a memory address it cannot access. It corresponds to a segmentation fault on Linux, and its main causes are use of a freed object, null pointer dereference, and incorrect pointer arithmetic. The cause is tracked down with Xcode's Zombie Objects or Address Sanitizer.

See also

• Segmentation fault
• General Protection Fault (GPF; EXC_I386_GPFLT)

Favorite site

• Understanding EXC_BAD_ACCESS ¹

References